Controller for electrically-operated machine-tools.



No. 871,199. PATENTED NOV. 19, 1907. J. R. BACK. CONTROLLER FOR BLBCTRIOALLY OPERATED MACHINE TOOLS.

APPLICATION FILED KAY 1, 1906. nmrnwnn szr'r. so, 1907.

' a SHEETS-SHEET 1.

PATLNTED NOV. 19, 1907.

J. R. BACK. CONTROLLER FOR ELEOTRIOALLY OPERATED MACHINE TOOLS.

APPLICATION FILED MAY 1, 1906. RENEWED SEPT. 30, 1907.

3 SHEETSSHEET 2.

Iva/51601;.-

messes:

PATENTED NOV. 19, 1907.

J. R. BACK. CONTROLLER FOR ELBCTRIGALLY OPERATED MACHINE TOOLS.

APPLICATION FILED HAY 1, 1906. RENEWED SEPT. 30, 1907.

3 SHEETS-SHEET 3.

w r resaesr eumw UNITED STATES PATENT OFFICE.

JOHN R. BACK, OF WORCESTER, MASSACHUSETTS. ASSIGNOR TO F. E. REED CO., OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

CONTROLLER FOR ELECTBICALLY-OPERATED MACHINE-TOOLS.

Specification of Letters Patent.

Patented Nov. 19, 1907.

Application filed May 1. 1906. Serial No. 314.648. Renewed September 30 1907- Sei-ial No. 395.184:-

To all whom it may concern:

' Be it known thatl, JOHN R. BACK, a citizen of theUnited States, residing at WVorcester, in the county of Worcester and State of Massachusetts, have invented a new and useful. Controller for Electrically-Operated Machine-Tools, of which the following is a specification.

My invention relates to a controlling device for motor-operated machine tools.

The principal object of the invention is to provide .a motor-operated engine lathe or other machine tool, with means adapted to be so set that. the only operation necessary for the operator to perform is to turn a controller handle back and forth, its motion being limited by adjustable stops or the like, to cause the machine to operate at any predetermined speed during the cutting operation and then be stopped or reversed at a predetermined speed. By providing means for accomplishing these results, it is possible to employ unskilled labor for operating niachines of this character, the foreman or overseer setting the machine and leaving the operator nothing to do but turn the controlling handle, eliminating the danger of burning out the insulation, running the speed too high, reversing the machine when it is merely desired to stop it, or making any other'errors of a similar character.

The means which I have provided for accomplishing these results is very simple and of a character not likely to easily be deranged in operation.

Reference is to be had to the accompany ing drawings in which, I

Figure 1. is a side elevation of an engine lathe provided with a device that constitutes one embodiment of my invention. Fig. 2 is a side elevation of a controller box shown in Fig. 1. Fig. 3 is an elevation of a controller gear box adapted to be connected with the controller box shown in Fig. 2. Fig. 4 is a plan of the parts as shown in Fig. 2. Fig. 5 is a plan of parts shown in Fig. 3. Fig. 6 is a fragmentary detailed view of a'stationary stop which can be employed. of a controller box constructed in accordance with the principles of my invention and showing a modification. Fig. 8 is a similar view showing another modification. Fig. 9 is a plan of still another modification. Fig. 10 is Fig. 7 is a'plan a plan of a modification in which the controller handle and regulating device are more closely associated. Fig. 1 1 is a plan of another modification similar to Fig. 10, and Fig. 12 is a fragmentary elevation sho wing one way in which the device can be applied at the other end of the machine."

Figs. 1 to 6, inclusive, represent one form of the invention as applied to an engine lathe of any ordinary construction which is operatedby an electric motor or the like, the

power to be transmitted from the motor to the lathe and consequently thespeed of operation of the lathe, being regulated by a controller 8. vided with a main shaft 9 on the lower end of which is a beveled gear 10 meshing with a gear 11 on a shaft 12. This shaft carries a gear 13 meshing with a gear 14 on a shaft 15 which, throu h gears 16 and 17 receives mo 'tion from a s aft 18 which is provided with.

an operating handle 19. WVhether the bandle 19 is connected with the controller shaft 9 in the manner iilustrated or otherwise, it will be understood that the motion of this handle is designed to be transmitted to said. shaft in such a way as to regulate the speed at which the lathe operates during the cut ting operation or the reverse. The parts so far described may be constructed in any ordinary way in order to secure this result.

For the purpose of limiting and controlling the angular position of the main shaft 9 of the controller, I have shown the latter as provided with an adjustable stopping device comprising a disk 20 having in the present instance, three series of holes or sockets 21, 22 and 23 for the reception of two removable pins 24 and 25. tion to engage these pins and limit the mo-. tion of the disk and consequently the an lar position of the controller shaft in accor ance A stop 26 is located in posi- In this form, the controller is pro- The series of holes 21 is used for the purpose of setting the pin 24 to control the forward The or cutting speed of the machine tool. series 22 is used for the reversing or back stop, while what I have referred to as the series 23, which in the present instance consists of only one hole, is for the purpose of limiting the motion of the disk and the controller shaft in such position as to entirely turn oil the power and stop the machine.

The pin 23 can be placed either in this hole or in one of the -holes of the series 22, while the pin 24is placed in oneof the holes in the series 21, according to thecharacter of work being done on the machine.

The gear box is'preferably provided with a pointer 27 and a scale 28 to indicate the position in which the controllershaft is located by the handle 19. It will be seen that by: placing one pin 24 in any desired one of the series of holes 21, the other pin 25 in hole 23,

' then turning the handle 19 to the right, the

disk will be rotated until the pin 24 engages the stop and the machine will run at the speed represented by the hole in which the pin 24 is located. By turning the handle to the left, the disk will be rotated in the 30 so setting the pin as to stop the controller handle in position to burn out the insulation.

It will be seen that after the pins are properl; set, the work can be, carried on by an unskilled operator, no judgment-being required except-to turn the handle when the cutting operation is finished or when it is to commence.

In the remaining figures, certain modifica tions are illustrated in which the same prin- 40 ciples can be carried out.

controller shaft. stop, theperforation 201secured to the top of the controller box..

F ig.-7 shows the disk 200 in which the several sets of perforations are located, as integrahwith t e top of the controller box, a stop 260 being mounted on and fixed .to the Fig. 8 shows the same I eing located in a'disk Fig. 9 shows a disk 202 keyed to the controller shaft while the stop comprises a lug 12)61 mounted on the top of the controller In Fig. 1.0 a disk 203 is. mounted on the gear box in fixed position and the handle 19 carries the stop 262.

Fig. 11 shows a disk 204 and handle 190 in one piece, the stop 263 being on the gear box casmg. l I

Fig. 12 shows the controller and. corresponding parts placed on the other end of t e lathe.

Upon consideration of the modifications which have been described above, it will be readily understood that my improvements are capable of bein carried out in a large number of ways wit out departing from the claims.

scope of the invention as expressed in the The invention is not limited to any or all of the particular forms illustrated, and is applicable to other forms of machine tools than the particular one shown in the drawngs,

Having thus fully described my invention, what I claim and desire to secure by Letters- 'Patent is v 1.. The combination with an electrically operated tool, of a controller therefor having an adjustable stopping device for-regulating the speed at which the tool is operated comprising a plate having, perforations,- pins adapted to be inserted in said perforations, and a stop for engaging the pins, a shaft for operating said stopping device, and a controller handle connected with said shaft.

2. 'The combination with a machine tool, of 'a motor for operating said tool, a controller for the motor having-a stop, and anadjustable stopping device for said stop to regulate the position of the stop and the speed at which the motor will operate the tool comprising a plate having perforations,

pins adapted to be inserted in said perforae tions, and a stop for engaging the pins, said stopping device. comprising a shaft connected with the controller, and a handle connected with the shaft.

3. The combination with a motor operated machine tool and a controller therefor having a main shaft, and adjustable means for limiting the position of the shaft, of a shaft for operatin said main shaft, a controller-handle, an a shaft on which said handle is mounted operatively connected with the second shaft.

4. The. combination of a motor operated machine tool with a controller therefor having a main shaft, adjustable means for limiting the position of they shaft. during the cutting operation, removable means for stopping the reverse motion of the shaft in such position as to turn off the power, a

shaft for operating said main shaft, a controller handle, and a shaft on which said handle is mounted operatively connected with the second shaft.

5. The combination with a motor operated'machine tool, of a controller therefor having a main shaft, adjustable means for limiting the position of the shaft during the cutting operation, adjustable means for limiting the position of the shaft during the reverse, a shaft for operating said main shaft, a handle, and a shaft on which said handle is mounted operatively connected with the second shaft.

located at a plurality of points for limiting determining the position of the controller shaft and the speed of operation of the tool.

7. A controller for a machine tool, comprising a main shaft, a disk and a stop, the disk and stop be' movable relatively to each other, said d isfii having a pin adjustably located thereon and adapted to engage the stop, and a removable in for limiting the relative motion of the disk and stop in position to turn-off the power.

8. A controller for machine tools, comprising a main controller shaft, 9. disk and a stop, said disk and stop being movable relativelyto each other and one of them being connected with said shaft, said disk bein provided with an adjustable in for limiting the relative motion of the disk and stop and determining the speed transmitted by the controller durin the cutting operation of the machine too and a second pin ad justably located on the disk for determining the speed during the reverse.

9. In a controller for machine tools and the like, the combination of a controller shaft, means for turning said shaft, a disk, a stop, said disk and stop being movable relatively "to each other and one of them being connected with said shaft, said disk being provided with a series of sockets or perforations, and a pin adapted to be mounted in said sockets or perforations and in position to eng e said stop.

10. A controller or machine tools and the like, comprising a main controller shaft, a

. disk having three series of socket-s or perforations, two pins ada ted to be mounted in said sockets or pe orations, and a stop located in position to engage said pins, the

position of said disk with respect to the stop controllingthe position of the controller shaft.

11. A. controller for machine tools and the like, comprising a main controller shaft, a disk having three series of sockets or perforations, two pins adapted to bemounted in said sockets or perforations, and a stop located in fposition to engage said ,pins, the

position 0 stop controlling the position of the contro ler shaft, one of said series of sockets being spaced from the others and located in position to cause the power to be turned off when the stop is in contact with a pin therein.

12. A controller for electric motors having in combination with a stop a relatively movable disk having pin-holes, and a pin adapted to be mounted in any of the pin holes for engaging the stop.

13. A controller for electric motors having in combination with adjustable pins a stop adapted to limit the relative motion of the stop and pins in forward and reverse positions.

14. The combination with a motor-operated machine tool, of a controller therefor comprising a center shaft, a plate fixed thereon and havin holes therein, the position of the holes eing determined by the number of revolutions desired on the for ward and reverse s eeds and by the position of the center sh necessary to stop the motor, two movable pins adapted to be fitted in the holes'in said plate, and a fixed stop adapted to contact with said pins and to stop the center shaft in position to reverse or stop the motor.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

7 JOHN R. BACK.

Witnesses: I I ALBERT 4EHFAY, J. ELMEB. HALL.

said disk with respect to the' 

